Critical engine modifications; squeeze as much PS (horsepower) out of it as possible.

S-engine
Part A-AKP
Part B-HRM
Part C-UNI

H-engine
Part A-UNI
Part B-HVN
Part C-HRM

V-engine
Part A-BAS
Part B-HRM
Part C-UNI

R-engine
Part A-HVN
Part B-HVN
Part C-HRM